不可以。“not later than+时间点”译为“不晚于...”，该“时间点”是包含在内的，而“before+时间点”是不包含该“时间点”的。在某种程度上，not later than相当于 on and before。

例

The Issuer shall, not later than 10.30 a.m. (London time) on the Business Day immediately preceding each date on which any payment in respect of the Bonds becomes due, transfer or procure to be transferred in the manner provided for in Clause 2.3 to the Principal Paying Agent or to its order such amount as may be required for the purposes of such payment.

发行人应在各与债券有关的任何款项到期之日前一个营业日不晚于上午10:30（伦敦时间），以第2.3条规定的方式，将实现该付款目的所需的金额向主要付款代理或按其指令转账或安排他人向主要付款代理或按其指令转账。